Scheme missing special keywords

[jcubic]

Found another missing features in Scheme syntax:

(syntax-case x)
(letrec-syntax x)
(let-syntax x)

They are special syntax for hygienic macro system, they are documented on Wikipedia.

[jcubic]

syntax-case is optional it's part of R6RS, GitHub don't highlight it, but Prism can support it, it's minor change.

[jcubic]

I'm wondering it's worth adding define-macro maybe multiple variants like /(def(ine)?-?macro)/

that will match:

define-macro
def-macro
defmacro
definemacro

this will make sure that different scheme implementations will have macro as keyword, I think that only defmacro and define-macro are needed, define-macro is more Scheme like (even that they are lisp macros) and defmacro is Common Lisp keyword.

[RunDevelopment]

Lisp has its own language definition independent of Scheme, so we don't need to add keywords to Scheme that aren't part of Scheme.

[jcubic]

define-macro is supported by lot of Scheme implementations, I think that it's not standard to have always given name, https://www.biwascheme.org/ supports define-macro the same as my interpreter, but it's not part of the standard.

[RunDevelopment]

In that case, I'll add it. I thought it was Lisp-specific.